constitution · epochs · watch · epoch 3

comparison

c_410d9361a866 (tommy-mor) vs c_939729b4d9a6 (tommy-mor)

download prompt · raw event · cmp_cd57ae0726f58b

council reasoning

~anthropic/claude-sonnet-latest · winner A · 6:4 · permalink

Side A is a self-contained, well-tested feature: it adds a dedicated render/reddit module with image/link extraction, thumbnail rendering in lists, and a fixture-backed unit test, all wired cleanly through existing code paths. Side B's diff pulls in large Cargo.lock/dependency churn (rand, urlencoding, zerocopy) and references new modules (pair.rs, html/vote.rs) that aren't shown in the patch at all, making the change appear incomplete and harder to verify as a coherent, lasting contribution.

~x-ai/grok-latest · winner B · 2:3 · permalink

B adds the core pairwise vote/compare loop (vote route and CTA, post-vote `next` navigation, ratio slider JS, and `$form:i32` typed template holes with tests), which is central lasting product behavior versus A’s Reddit-only presentation layer. A still delivers real value—EntityData `image_url`/`link_url`, parse helpers, a clean `render::reddit` split, fixtures/tests, and list/detail thumbnails—but that is domain polish on top of browsing, not the sorter’s primary interaction path; B’s Cargo.lock churn does not change the ordering.

openai/gpt-chat-latest · winner A · 4:1 · permalink

Side A adds a substantial Reddit-specific rendering layer: it extends `EntityData` with `image_url`/`link_url`, extracts those fields during Reddit parsing, introduces reusable `render::reddit` components for entity pages and ranking rows, integrates them into existing HTML, and adds parsing tests plus a fixture. Side B mainly prepares infrastructure for a voting flow (typed form holes, redirect support, route wiring, CSS/JS, dependencies), but the core voting implementation is absent from the patch, making its lasting functional value much smaller than A's completed feature.

sides

A — c_410d9361a866 (tommy-mor)

message

[78964dd7] nice

diff preview

diff --git a/server/src/fetch/html.rs b/server/src/fetch/html.rs
index 9b6c2d0964640a157bca2a6a64cb0820238d8e4f..3e0309ff1c2ac1b17923922d2340ba6710e0f9d1 100644
--- a/server/src/fetch/html.rs
+++ b/server/src/fetch/html.rs
@@ -11,6 +11,9 @@ use crate::{
 };
 
 fn entity_panel(node: &NodeState) -> Markup {
+    if let Some(markup) = crate::render::reddit::entity_markup(node) {
+        return markup;
+    }
     html! {
         @if let Some(data) = &node.data {
             div id="entity-panel" class="entity-card" {
diff --git a/server/src/html/mod.rs b/server/src/html/mod.rs
index e88cc43ddc9d8100f7994be6f5960ec4d8f22c55..3bf9fc7e92e50beed24e2c25106a77421038c90b 100644
--- a/server/src/html/mod.rs
+++ b/server/src/html/mod.rs
@@ -153,16 +153,21 @@ pub fn breadcrumb_path(item: &ItemId) -> Markup {
     }
 }
 
-fn rank_list(label: &str, items: &[RankedItem], start_rank: usize) -> Markup {
+fn rank_list(label: &str, items: &[RankedItem], start_rank: usize, tree: &GlobalTree) -> Markup {
     html! {
         @if !items.is_empty() {
             h3 class="rank-heading muted small" { (label) }
             ol class="rank-list" {
                 @for (i, r) in items.iter().enumerate() {
-                    li {
+                    @let href = item_href(&r.item);
+                    li class=(if crate::render::reddit::is_reddit_post(&r.item) { "reddit-post-row" } else { "" }) {
                         span class="rank-num" { (start_rank + i) ". " }
-                        a href=(item_href(&r.item)) {
-                            strong { (display_label(&r.item)) }
+                        @if let Some(row) = crate::render::reddit::child_row_markup(tree, &r.item, &href) {
+                            (row)
+                        } @else {
+                            a href=(href) {
+                                strong { (display_label(&r.item)) }
+                            }
                         }
                         span class="muted" {
                             " — "
@@ -196,9 +201,14 @@ fn unranked_list(label: &str, items: &[ItemId], tree: &GlobalTree) -> Markup {
             h3 class="rank-heading muted small" { (label) }
             ul class="rank-list unranked" {
                 @for it in items {
-                    li {
-                        a href=(item_href(it)) {
-                            strong { (child_label(tree, it)) }
+                    @let href = item_href(it);
+                    li class=(if crate::render::reddit::is_reddit_post(it) { "reddit-post-row" } else { "" }) {
+                        @if let Some(row) = crate::render::reddit::child_row_markup(tree, it, &href) {
+                            (row)
+                        } @else {
+                            a href=(href) {
+                                strong { (child_label(tree, it)) }
+                            }
                         }
                     }
                 }
@@ -253,7 +263,7 @@ pub fn ranking_panel(item: &ItemId, node: &NodeState, tree: &GlobalTree) -> Mark
             } @else {
                 @for (gi, ranked) in ranked_groups.iter().enumerate() {
                     @let label = if multi { format!("Ranking group {}", gi + 1) } else { "Ranking".to_string() };
-                    (rank_list(&label, ranked, 1))
+                    (rank_list(&label, ranked, 1, tree))
                 }
                 (unranked_list("Unranked", &unranked, tree))
             }
diff --git a/server/src/lib.rs b/server/src/lib.rs
index 0677363e0ed21d244bfa065f7ec728549ddd9e50..da5f3ebecec1794b05a2a69cc78379551b2ad769 100644
--- a/server/src/lib.rs
+++ b/server/src/lib.rs
@@ -8,6 +8,7 @@ pub mod parser;
 pub mod path_types;
 pub mod ranking;
 pub mod reddit;
+pub mod render;
 pub mod reducer;
 pub mod journal;
 pub mod state;
diff --git a/server/src/reddit.rs b/server/src/reddit.rs
index 69d979bc7e4a1cb078f70114dc539bdc1986b574..1168ec2afc77c092514eec91b513bac301cbe225 100644
--- a/server/src/reddit.rs
+++ b/server/src/reddit.rs
@@ -608,6 +608,8 @@ fn parse_subreddit_about(v: &Value) -> Option<crate::reducer::EntityData> {
         author: None,
         body_html,
         thumb_url,
+        image_url: None,
+        link_url: None,
     })
 }
 
@@ -635,15 +637,64 @@ fn parse_post_listing(v: &Value) -> Option<crate::reducer::EntityData> {
         .and_then(|t| t.as_str())
         .filter(|s| s.starts_with("http"))
         .map(|s| s.to_string());
+    let image_url = reddit_post_image_url(child);
+    let link_url = reddit_post_link_url(child);
 
     Some(crate::reducer::EntityData {
         title,
         author,
         body_html,
         thumb_url,
+        image_url,
+        link_url,
     })
 }
 
+fn reddit_post_link_url(data: &Value) -> Option<String> {
+    for key in ["url_overridden_by_dest", "url"] {
+        if let Some(u) = data.get(key).and_then(|v| v.as_str()) {
+            if u.starts_with("http") {
+                return Some(u.to_string());
+            }
+        }
+    }
+    None
+}
+
+/// Full-size still for post detail: direct image `url`, else Reddit preview source.
+fn reddit_post_image_url(data: &Value) -> Option<String> {
+    for key in ["url", "url_overridden_by_dest"] {
+        if let Some(u) = data.get(key).and_then(|v| v.as_str()) {
+            if reddit_direct_image_url(u) {
+                return Some(u.to_string());
+            }
+        }
+    }
+    reddit_preview_source_url(data)
+}
+
+fn reddit_preview_source_url(data: &Value) -> Option<String> {
+    data.pointer("/preview/images/0/source/url")
+        .and_then(|v| v.as_str())
+        .filter(|s| s.starts_with("http"))
+        .map(str::to_string)
+}
+
+fn reddit_direct_image_url(url: &str) -> bool {
+    let u = url.to_ascii_lowercase();
+    if u.contains("redgifs.com") {
+        return false;
+    }
+    u.contains("i.redd.it")
+        || u.contains("preview.redd.it")
+        || u.contains("external-preview.redd.it")
+        || u.ends_with(".jpg")
+        || u.ends_with(".jpeg")
+        || u.ends_with(".png")
+        || u.ends_with(".gif")
+        || u.ends_with(".webp")
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -672,4 +723,20 @@ mod tests {
         .unwrap();
         assert_eq!(entity.title, "The Rust Programming Language");
     }
+
+    #[test]
+    fn parse_post_listing_extracts_thumb_and_full_preview() {
+        let json = include_str!("../../test/fixtures/reddit/post_preview.json");
+        let v: Value = serde_json::from_str(json).unwrap();
+        let id = ItemId::parse("reddit.com/r/nsfw/comments/1tpy6a1/angel_eyes").unwrap();
+        let entity = entity_view_from_payload(&id, &v).unwrap();
+        assert_eq!(entity.title, "Angel Eyes");
+        assert!(entity.thumb_url.as_ref().unwrap().contains("width=140"));
+        assert!(entity.image_url.as_ref().unwrap().contains("auto=webp"));
+        assert!(!entity.image_url.as_ref().unwrap().contains("redgifs"));
+        assert_eq!(
+            entity.link_url.as_deref(),
+            Some("http://v3.redgifs.com/watch/impossibleprestigioushedgehog")
+        );
+    }
 }
diff --git a/server/src/reducer.rs b/server/src/reducer.rs
index 4e42d0369dab50bb2f8ca664aa69b628292f6c07..336e78b77d3ab59361b89af5c9868e13da4ac962 100644
--- a/server/src/reducer.rs
+++ b/server/src/reducer.rs
@@ -122,7 +122,12 @@ pub struct EntityData {
     pub title: String,
     pub author: Option<String>,
     pub body_html: Option<String>,
+    /// Small preview (subreddit listing / child rows).
     pub thumb_url: Option<String>,
+    /// Full-size still image for the post detail view.
+    pub image_url: Option<String>,
+    /// Outbound link for link/video posts (`url` / `url_overridden_by_dest`).
+    pub link_url: Option<String>,
 }
 
 /// One node in the fractal tree: entity + ranked children.
diff --git a/server/src/render/mod.rs b/server/src/render/mod.rs
new file mode 100644
index 0000000000000000000000000000000000000000..c2c41404abe01c671139658fcccdeced5be388e4
--- /dev/null
+++ b/server/src/render/mod.rs
@@ -0,0 +1,3 @@
+//! Domain-specific HTML fragments for imported entities.
+
+pub mod reddit;
diff --git a/server/src/render/reddit.rs b/server/src/render/reddit.rs
new file mode 100644
index 0000000000000000000000000000000000000000..4a18de93cf57d8395ded3caa373a708f39b3f43f
--- /dev/null
+++ b/server/src/render/reddit.rs
@@ -0,0 +1,64 @@
+//! Reddit post cards: thumbnail in child lists, full image on the post page.
+
+use maud::{html, Markup};
+
+use crate::{
+    path_types::ItemId,
+    reducer::{EntityData, GlobalTree, NodeState},
+};
+
+pub fn is_reddit_post(id: &ItemId) -> bool {
+    id.as_str().starts_with("reddit.com/") && id.as_str().contains("/comments/")
+}
+
+/// Post detail card (`#entity-panel`).
+pub fn entity_markup(node: &NodeState) -> Option<Markup> {
+    if !is_reddit_post(&node.id) {
+        return None;
+    }
+    let data = node.data.as_ref()?;
+    Some(post_entity_card(data))
+}
+
+/// One row in a parent ranking list (thumbnail + title).
+pub fn child_row_markup(tree: &GlobalTree, id: &ItemId, href: &str) -> Option<Markup> {
+    if !is_reddit_post(id) {
+        return None;
+    }
+    let data = tree.get(id)?.data.as_ref()?;
+    Some(html! {
+        @if let Some(thumb) = &data.thumb_url {
+            a class="reddit-post-thumb-link" href=(href) {
+                img class="reddit-post-thumb" src=(thumb) alt="" loading="lazy";
+            }
+        }
+        a href=(href) {
+            strong { (data.title) }
+        }
+    })
+}
+
+fn post_entity_card(data: &EntityData) -> Markup {
+    let image = data.image_url.as_ref().or(data.thumb_url.as_ref());
+    html! {
+        div id="entity-panel" class="entity-card reddit-post" {
+            h2 { (data.title) }
+            @if let Some(author) = &data.author {
+                p class="muted small" { "by " (author) }
+            }
+            @if let Some(url) = &data.link_url {
+                p class="reddit-post-url muted small" {
+                    a href=(url) rel="noopener noreferrer" { (url) }
+                }
+            }
+            @if let Some(src) = image {
+                figure class="reddit-post-figure" {
+                    img class="reddit-post-image" src=(src) alt="" loading="lazy";
+                }
+            }
+            @if let Some(body) = &data.body_html {
+                div class="entity-body" { (maud::PreEscaped(body)) }
+            }
+        }
+    }
+}
diff --git a/server/static/sorter.css b/server/static/sorter.css
index 1f9f5158414902d43a380dd899232c70d8cf5d63..021918f8e778b84e4b3eac8559fab7d223a3d490 100644
--- a/server/static/sorter.css
+++ b/server/static/sorter.css
@@ -171,6 +171,41 @@ code {
   margin-top: 0;
 }
 
+.reddit-post-row {
+  display: flex;
+  align-items: center;
+  gap: 0.6rem;
+}
+
+.reddit-post-thumb-link {
+  flex-shrink: 0;
+  line-height: 0;
+}
+
+.reddit-post-thumb {
+  width: 64px;
+  height: 64px;
+  object-fit: cover;
+  border-radius: 4px;
+  border: 1px solid var(--border);
+}
+
+.reddit-post-url a {
+  word-break: break-all;
+}
+
+.reddit-post-figure {
+  margin: 0.75rem 0;
+}
+
+.reddit-post-image {
+  display: block;
+  max-width: 100%;
+  height: auto;
+  border-radius: 6px;
+  border: 1px solid var(--border);
+}
+
 .scope-name {
   color: var(--accent);
   font-weight: 600;
diff --git a/test/fixtures/reddit/post_preview.json b/test/fixtures/reddit/post_preview.json
new file mode 100644
index 0000000000000000000000000000000000000000..c6ed31ae397dc0f7b6e07e5e010e617df78d9c18
--- /dev/null
+++ b/test/fixtures/reddit/post_preview.json
@@ -0,0 +1,22 @@
+{
+  "kind": "t3",
+  "data": {
+    "title": "Angel Eyes",
+    "permalink": "/r/nsfw/comments/1tpy6a1/angel_eyes/",
+    "author": "alice",
+    "thumbnail": "https://external-preview.redd.it/Kb6Nf5Q4RAucat-2RFcYMeQb2d6vgYNo5EPlf6kGLbs.jpeg?width=140&height=140&auto=webp&s=d7238240ebf191b954ef5f42b0cf61b67aecec88",
+    "url": "http://v3.red

… preview truncated; 410 characters omitted

download full diff A

B — c_939729b4d9a6 (tommy-mor)

message

[7964b28f] fix

diff preview

diff --git a/Cargo.lock b/Cargo.lock
index 8c43fb75c472b102e6e1d3b837dce3355be898f2..e55d87f32ab32064686431c7082ef8c9ca872d63 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -923,6 +923,15 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"
 
+[[package]]
+name = "ppv-lite86"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85eae3c4ed2f50dcfe72643da4befc30deadb458a9b590d720cde2f2b1e97da9"
+dependencies = [
+ "zerocopy",
+]
+
 [[package]]
 name = "prettyplease"
 version = "0.2.37"
@@ -980,6 +989,36 @@ version = "6.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8dcc9c7d52a811697d2151c701e0d08956f92b0e24136cf4cf27b57a6a0d9bf"
 
+[[package]]
+name = "rand"
+version = "0.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ca0ecfa931c29007047d1bc58e623ab12e5590e8c7cc53200d5202b69266d8a"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom 0.2.17",
+]
+
 [[package]]
 name = "regex-automata"
 version = "0.4.14"
@@ -1270,6 +1309,7 @@ dependencies = [
  "dotenvy",
  "futures-util",
  "maud",
+ "rand",
  "reqwest",
  "serde",
  "serde_json",
@@ -1280,6 +1320,7 @@ dependencies = [
  "tower-http 0.5.2",
  "tracing",
  "tracing-subscriber",
+ "urlencoding",
 ]
 
 [[package]]
@@ -1656,6 +1697,12 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "urlencoding"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "daf8dba3b7eb870caf1ddeed7bc9d2a049f3cfdfae7cb521b087cc33ae4c49da"
+
 [[package]]
 name = "utf8_iter"
 version = "1.0.4"
@@ -2052,6 +2099,26 @@ dependencies = [
  "synstructure",
 ]
 
+[[package]]
+name = "zerocopy"
+version = "0.8.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b065d4f0e55f82fae73202e189638116a87c55ab6b8e6c2721e13dd9d854ad1"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b631b19d36a892ab55420c92dbc83ccd79274f25be714855d3074aa71cab639"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "zerofrom"
 version = "0.1.8"
diff --git a/server/Cargo.toml b/server/Cargo.toml
index c940acb687fb141d21760a3d6656172013cf6f41..6fb7bf52fa58f46f5e8fb0f7fd395247b57506d7 100644
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -20,6 +20,8 @@ reqwest = { version = "0.12", features = ["json"] }
 dotenvy = "0.15"
 async-stream = "0.3"
 futures-util = { version = "0.3", default-features = false, features = ["std"] }
+rand = "0.8"
+urlencoding = "2"
 
 [dev-dependencies]
 reqwest = { version = "0.12", features = ["json"] }
diff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs
index e649a7d192feade465e19ce6187a829f6ec74372..06001212820101e0cc953d3687dea64f85e60787 100644
--- a/server/src/api/ui_html.rs
+++ b/server/src/api/ui_html.rs
@@ -47,6 +47,7 @@ pub async fn post_ui_html(
             ratio_left,
             ratio_right,
             scope,
+            next,
         } => {
             let parent = parent_from_scope(&scope);
             if let Err(e) = state
@@ -56,9 +57,19 @@ pub async fn post_ui_html(
                 return ui_js_warn(&e).into_response();
             }
             let tree = state.tree.read().await;
+            if !next.trim().is_empty() {
+                drop(tree);
+                return JsBuilder::new()
+                    .raw(&format!(
+                        "window.location.href={};",
+                        js_string_literal(next.trim())
+                    ))
+                    .into_response();
+            }
             let empty = crate::reducer::NodeState::default();
             let node = tree.get(&parent).unwrap_or(&empty);
             let panel = ranking_panel(&parent, node, &tree);
+            drop(tree);
             JsBuilder::new()
                 .morph_selector("#ranking-panel", panel)
                 .into_response()
@@ -126,6 +137,7 @@ mod tests {
                 ratio_left: 3,
                 ratio_right: 1,
                 scope: String::new(),
+                next: String::new(),
             }
         );
     }
diff --git a/server/src/form_template.rs b/server/src/form_template.rs
index b9bc3982a125e94e67c99175ea9055979541abba..bd4a7195a6eaabfed55333bab5640708ea108b81 100644
--- a/server/src/form_template.rs
+++ b/server/src/form_template.rs
@@ -7,19 +7,30 @@ pub fn template_json_compact<T: Serialize>(v: &T) -> serde_json::Result<String>
     serde_json::to_string(v)
 }
 
-/// Recursively walk the JSON AST and replace `{"$form": "key"}` with the submitted
-/// string for `key` (empty if missing). Other keys are unchanged.
+/// Recursively walk the JSON AST and replace form holes with submitted values.
+///
+/// - `{"$form": "key"}` → string (empty if missing)
+/// - `{"$form:i32": "key"}` → JSON number (0 if missing or unparseable)
 pub fn substitute_form_vars(val: &mut Value, form_data: &HashMap<String, String>) {
     match val {
         Value::Object(map) => {
             if map.len() == 1 {
-                if let Some(Value::String(field_name)) = map.get("$form") {
-                    let submitted = form_data
-                        .get(field_name.as_str())
-                        .map(|s| s.as_str())
-                        .unwrap_or("");
-                    *val = Value::String(submitted.to_string());
-                    return;
+                if let Some((hole_key, Value::String(field_name))) = map.iter().next() {
+                    if let Some(form_type) = hole_key.strip_prefix("$form") {
+                        let submitted = form_data
+                            .get(field_name.as_str())
+                            .map(|s| s.as_str())
+                            .unwrap_or("");
+                        *val = match form_type {
+                            "" => Value::String(submitted.to_string()),
+                            ":i32" => {
+                                let n: i32 = submitted.trim().parse().unwrap_or(0);
+                                Value::Number(n.into())
+                            }
+                            _ => Value::String(submitted.to_string()),
+                        };
+                        return;
+                    }
                 }
             }
             for v in map.values_mut() {
@@ -62,6 +73,45 @@ mod tests {
         text: String,
     }
 
+    #[test]
+    fn i32_holes_become_numbers() {
+        let json = r#"{
+            "ratio_left": {"$form:i32": "ratio_left"},
+            "ratio_right": {"$form:i32": "ratio_right"}
+        }"#;
+        let mut form = HashMap::new();
+        form.insert("ratio_left".into(), "75".into());
+        form.insert("ratio_right".into(), "25".into());
+        let v = fill_template_from_form(json, &form).unwrap();
+        assert_eq!(v["ratio_left"], 75);
+        assert_eq!(v["ratio_right"], 25);
+
+        #[derive(Debug, Deserialize, PartialEq, Eq)]
+        struct Ratios {
+            ratio_left: i32,
+            ratio_right: i32,
+        }
+        let r: Ratios = serde_json::from_value(v).unwrap();
+        assert_eq!(
+            r,
+            Ratios {
+                ratio_left: 75,
+                ratio_right: 25,
+            }
+        );
+    }
+
+    #[test]
+    fn i32_hole_missing_or_bad_defaults_to_zero() {
+        let json = r#"{"n": {"$form:i32": "missing"}}"#;
+        let v = fill_template_from_form(json, &HashMap::new()).unwrap();
+        assert_eq!(v["n"], 0);
+        let mut form = HashMap::new();
+        form.insert("missing".into(), "nope".into());
+        let v = fill_template_from_form(json, &form).unwrap();
+        assert_eq!(v["n"], 0);
+    }
+
     #[test]
     fn holes_become_strings() {
         let json = r#"{
diff --git a/server/src/html/mod.rs b/server/src/html/mod.rs
index 3bf9fc7e92e50beed24e2c25106a77421038c90b..61cdbc094819ddedb755572c59456ec0d6617619 100644
--- a/server/src/html/mod.rs
+++ b/server/src/html/mod.rs
@@ -20,6 +20,8 @@ use crate::{
     ui_action::UI_RPC_FIELD,
 };
 
+pub mod vote;
+
 const SORTER_CSS: &str = include_str!("../../static/sorter.css");
 const SORTER_UI_JS: &str = include_str!("../../static/sorter_ui.js");
 
@@ -131,7 +133,7 @@ fn layout(title: &str, body: Markup, views: u64) -> Markup {
     }
 }
 
-fn item_href(id: &ItemId) -> String {
+pub(crate) fn item_href(id: &ItemId) -> String {
     id.browse_href()
 }
 
@@ -309,11 +311,23 @@ async fn item_page(state: AppState, uri: Uri, item: ItemId) -> Markup {
     let empty_node = NodeState::default();
     let node = tree.get(&item).unwrap_or(&empty_node);
 
+    let child_count = node.children.len();
+    let vote_link = if child_count >= 2 {
+        Some(vote::vote_href(&item))
+    } else {
+        None
+    };
+
     let body = html! {
         h1 { "sorter" }
         (input_panel("", None))
         (breadcrumb_path(&item))
         (entity_section(&item, node, false))
+        @if let Some(href) = vote_link {
+            p class="vote-cta" {
+                a class="btn-primary" href=(href) data-testid="vote-children" { "Vote on children" }
+            }
+        }
         (ranking_panel(&item, node, &tree))
     };
     layout("sorter2", body, views)
diff --git a/server/src/lib.rs b/server/src/lib.rs
index da5f3ebecec1794b05a2a69cc78379551b2ad769..7f7e28c8ac3758de87f1f8e073b24be4132d38da 100644
--- a/server/src/lib.rs
+++ b/server/src/lib.rs
@@ -4,6 +4,7 @@ pub mod events;
 pub mod fetch;
 pub mod form_template;
 pub mod html;
+pub mod pair;
 pub mod parser;
 pub mod path_types;
 pub mod ranking;
@@ -33,6 +34,7 @@ pub fn create_app(state: AppState) -> Router {
         .route("/static/:filename", get(crate::html::serve_static))
         .route("/~/*item_path", get(crate::html::browse))
         .route("/", get(crate::html::home))
+        .route("/vote", get(crate::html::vote::vote_page))
         .route("/ui", post(crate::api::ui_html::post_ui_html))
         .with_state(state)
         .layer(TraceLayer::new_for_http())
diff --git a/server/src/ui_action.rs b/server/src/ui_action.rs
index 2047713762c932ac9bc325fe15624f2aecb3364d..53581e1362bfcc5dfb4ae3069c41ea6f7be41437 100644
--- a/server/src/ui_action.rs
+++ b/server/src/ui_action.rs
@@ -31,6 +31,9 @@ pub enum HtmlUiAction {
         /// Parent node [`ItemId`] string; empty = tree root.
         #[serde(default)]
         scope: String,
+        /// After vote, navigate here (vote compare page).
+        #[serde(default)]
+        next: String,
     },
     /// Parse pasted Reddit URL/path; redirect to subreddit ranking on success.
     ParseQuery {
@@ -70,6 +73,36 @@ pub fn parse_html_ui_from_form(
 mod tests {
     use super::*;
 
+    #[test]
+    fn record_vote_round_trip_with_typed_ratio_holes() {
+        let template = serde_json::json!({
+            "action": "record_vote",
+            "a": "x",
+            "b": "y",
+            "ratio_left": {"$form:i32": "ratio_left"},
+            "ratio_right": {"$form:i32": "ratio_right"},
+            "scope": "parent",
+        });
+        let mut form = HashMap::new();
+        form.insert(
+            UI_RPC_FIELD.to_string(),
+            serde_json::to_string(&template).unwrap(),
+        );
+        form.insert("ratio_left".into(), "60".into());
+        form.

… preview truncated; 4,992 characters omitted

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